Thru Bulkhead Initiator

2-350490-1 & 107488

Product Description

A Thru Bulkhead Initiator (TBI) is an initiation device that utilizes a shock input stimulus where the TBI donor charge initiates and transfers a shock wave through an adjacent structural bulkhead with sufficient intensity to cause the initiation of a receptor charge on the opposite side of the bulkhead. The TBI provides a detonation or deflagration at the output end of the device without breaching the bulkhead which is designed to provide a pressure containment barrier post functioning.

We offer an entire array of Thru Bulkhead Initiator (TBI) that can be used for initial system activation, signal transmission, signal transfer or changes in signal medium type. We design mechanical, hot gas pressure and detonation initiation with single or redundant features – either explosive loaded or inert. If your needs require it, an internal time delay element can be added for sequencing requirements. Our TBIs are nonelectric initiators which require a detonation input to transfer energy through an internal bulkhead.

The primary function of the TBI is to propagate sufficient energy through this integral bulkhead to then initiate a detonation or deflagration at the output end of the device. The initiator’s internal bulkhead is designed not to breach. Typical applications for these units are in rocket motor and gas generator ignition where it is critical to maintain a pressure tight seal after functioning.

Key Features

  • Extremely dependable
  • Space rated materials
  • One-piece bulkhead and separate input adapter design
  • FCDCA initiation
  • Accepts various FCDCA sizes
  • Hermetically sealed
  • Functions in a broad range of temperatures
  • Post function backpressure > 4300 psig
  • Proficient with man-rated platforms
  • Ratchet configuration available

What a Thru Bulkhead Initiator Can Do

The bulkhead is intended to provide a structural barrier to prevent loss of pressure of downstream elements of the end item application. TBI outputs can be configured to fit the needs of any application by varying the design of the booster downstream of the receptor charge.


The TBI, also known as a bulkhead initiator, is used in Arm/Fire devices, solid rocket motor ignition and applications where it is critical to prevent loss of pressure of downstream elements of the end item. The thru bulkhead initiator is generally used where complete sealing is needed between explosive elements after firing.

Our TBI designs are qualified and used as a rocket motor ignition component on multiple launch vehicle platforms including NASA’s Titan II GLV. We has also created a TBI adapted for use in deep underground application where high temperature performance is critical.


  • Input Stimulus
    • Shock Input
      • FCDC (equiv. 1 grain HNS)
    • Detonator
  • Output Deflagration
    Tailored peak output pressure performance in 10cc closed bomb
  • Detonation
    0.017-inch dent depth in Aluminum witness plate
  • Ignition Time
    ≤ 10 milliseconds
  • Operating Temperature
    Designs with operating temperature down to -65°F and up to 400°F
  • Leakage (pre-function)
    Designs that comply with 1 x 10-6 cc He/sec at 1 atm
  • Pressure Containment (post function)
    Designs to withstand up to 25,000 psig
  • Applicable Specifications 


Many features such as the input interface, thread, length, output, and other features can be customized to meet many applications.


  • Do I need a TBI?

    If you can provide us your back pressure requirements then we can determine if it's necessary.

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